SEGMENT AND GEOGRAPHIC DATA Segment Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) segments	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segments			3
Revenue, from external customers	$ 113,067	$ 122,743	$ 214,294	$ 247,060
Inter-segment revenue	0	0	0	0
Total revenue	113,067	122,743	214,294	247,060
Gross margin, from external customers	46,839	50,222	88,101	98,126
Inter-segment gross margin	0	0	0	0
Gross margin	46,839	50,222	88,101	98,126
Gain (Loss) on Disposition of Business, Continuing Operations	0	20,005	0	20,005
Business reorganization expenses (recovery)	144	2,060	781	3,403
EBITDA (loss)	(1,633)	14,577	(4,787)	8,985
Depreciation and amortization	805	974	1,493	2,085
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(101)	(369)	(155)	(449)
Income (loss) from continuing operations before provision for income taxes	(2,539)	13,234	(6,435)	6,451
Accounts receivable, net	67,368	75,511	67,368	75,511	$ 62,420
Long-lived assets, net of accumulated depreciation and amortization	9,365	10,261	9,365	10,261
Total assets	115,928	137,250	115,928	137,250	$ 124,949
Hudson Asia Pacific
Segment Reporting Information [Line Items]
Total revenue	14,157	16,033	26,095	30,133
Long-lived assets, net of accumulated depreciation and amortization	3,056	2,617	3,056	2,617
Hudson Europe
Segment Reporting Information [Line Items]
Total revenue	14,903	15,547	27,026	37,405
Long-lived assets, net of accumulated depreciation and amortization	180	90	180	90
Operating Segments | Hudson Americas
Segment Reporting Information [Line Items]
Revenue, from external customers	3,661	10,183	7,498	21,161
Inter-segment revenue	(22)	0	(22)	0
Total revenue	3,639	10,183	7,476	21,161
Gross margin, from external customers	3,180	5,081	6,520	9,702
Inter-segment gross margin	(25)	(2)	(25)	(9)
Gross margin	3,155	5,079	6,495	9,693
Gain (Loss) on Disposition of Business, Continuing Operations		15,938	0	15,938
Business reorganization expenses (recovery)	(22)	(5)	(38)	417
EBITDA (loss)	(178)	15,444	(15)	13,814
Depreciation and amortization	8	106	31	208
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	0	(310)	0	(344)
Income (loss) from continuing operations before provision for income taxes	(186)	15,028	(46)	13,262
Accounts receivable, net	2,637	7,155	2,637	7,155
Long-lived assets, net of accumulated depreciation and amortization	20	443	20	443
Total assets	5,793	9,202	5,793	9,202
Operating Segments | Hudson Asia Pacific
Segment Reporting Information [Line Items]
Revenue, from external customers	62,039	57,374	113,110	110,514
Inter-segment revenue	(1)	0	0	0
Total revenue	62,038	57,374	113,110	110,514
Gross margin, from external customers	22,416	23,819	41,187	44,697
Inter-segment gross margin	(62)	(207)	(121)	(239)
Gross margin	22,354	23,612	41,066	44,458
Gain (Loss) on Disposition of Business, Continuing Operations		0	0	0
Business reorganization expenses (recovery)	77	325	274	333
EBITDA (loss)	575	(630)	(656)	173
Depreciation and amortization	435	572	838	1,243
Intercompany interest income (expense), net	0	0	0	0
Interest income (expense), net	(88)	(42)	(128)	(83)
Income (loss) from continuing operations before provision for income taxes	52	(1,244)	(1,622)	(1,153)
Accounts receivable, net	35,272	30,383	35,272	30,383
Long-lived assets, net of accumulated depreciation and amortization	7,323	7,090	7,323	7,090
Total assets	55,990	49,717	55,990	49,717
Operating Segments | Hudson Europe
Segment Reporting Information [Line Items]
Revenue, from external customers	47,367	55,186	93,686	115,385
Inter-segment revenue	86	231	147	246
Total revenue	47,453	55,417	93,833	115,631
Gross margin, from external customers	21,243	21,322	40,394	43,727
Inter-segment gross margin	87	209	146	248
Gross margin	21,330	21,531	40,540	43,975
Gain (Loss) on Disposition of Business, Continuing Operations		4,067	0	4,067
Business reorganization expenses (recovery)	109	520	593	1,400
EBITDA (loss)	1,553	3,449	1,223	1,298
Depreciation and amortization	193	219	376	446
Intercompany interest income (expense), net	(58)	(138)	(115)	(268)
Interest income (expense), net	(9)	(14)	(23)	(19)
Income (loss) from continuing operations before provision for income taxes	1,293	3,078	709	565
Accounts receivable, net	29,459	37,973	29,459	37,973
Long-lived assets, net of accumulated depreciation and amortization	1,506	1,973	1,506	1,973
Total assets	51,663	58,580	51,663	58,580
Corporate
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	0	0	0	0
Total revenue	0	0	0	0
Gross margin, from external customers	0	0	0	0
Inter-segment gross margin	0	0	0	0
Gross margin	0	0	0	0
Gain (Loss) on Disposition of Business, Continuing Operations		0	0	0
Business reorganization expenses (recovery)	(20)	1,220	(48)	1,253
EBITDA (loss)	(3,583)	(3,686)	(5,339)	(6,300)
Depreciation and amortization	169	77	248	188
Intercompany interest income (expense), net	58	134	115	268
Interest income (expense), net	(4)	(3)	(4)	(3)
Income (loss) from continuing operations before provision for income taxes	(3,698)	(3,632)	(5,476)	(6,223)
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	516	755	516	755
Total assets	2,482	19,751	2,482	19,751
Elimination
Segment Reporting Information [Line Items]
Revenue, from external customers	0	0	0	0
Inter-segment revenue	(63)	(231)	(125)	(246)
Total revenue	(63)	(231)	(125)	(246)
Gross margin, from external customers	0	0	0	0
Inter-segment gross margin	0	0	0	0
Gross margin	0	0	0	0
Gain (Loss) on Disposition of Business, Continuing Operations		0	0	0
Business reorganization expenses (recovery)	0	0	0	0
EBITDA (loss)	0	0	0	0
Depreciation and amortization	0	0	0	0
Intercompany interest income (expense), net	0	4	0	0
Interest income (expense), net	0	0	0	0
Income (loss) from continuing operations before provision for income taxes	0	4	0	0
Accounts receivable, net	0	0	0	0
Long-lived assets, net of accumulated depreciation and amortization	0	0	0	0
Total assets	$ 0	$ 0	$ 0	$ 0